/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "DiagonalMatrix.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

template<class Type>
template<class Form>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const Matrix<Form, Type>& a)
:
	List<Type>(min(a.n(), a.m()))
{
	forAll(*this, i)
	{
		this->operator[](i) = a[i][i];
	}
}


template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label size)
:
	List<Type>(size)
{}


template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label size, const Type& val)
:
	List<Type>(size, val)
{}


template<class Type>
Foam::DiagonalMatrix<Type>& Foam::DiagonalMatrix<Type>::invert()
{
	forAll(*this, i)
	{
		Type x = this->operator[](i);
		if (mag(x) < VSMALL)
		{
			this->operator[](i) = Type(0);
		}
		else
		{
			this->operator[](i) = Type(1)/x;
		}
	}

	return this;
}


template<class Type>
Foam::DiagonalMatrix<Type> Foam::inv(const DiagonalMatrix<Type>& A)
{
	DiagonalMatrix<Type> Ainv = A;

	forAll(A, i)
	{
		Type x = A[i];
		if (mag(x) < VSMALL)
		{
			Ainv[i] = Type(0);
		}
		else
		{
			Ainv[i] = Type(1)/x;
		}
	}

	return Ainv;
}


// ************************************************************************* //
